On behalf of ISEHD organizing committee it is our pleasure to welcome you to XI International Symposium on Electrohydrodynamics, ISEHD 2019. We are honored to host this event at St. Petersburg State University (St. Petersburg, Russia). The main objective of the ISEHD series is to promote international cooperation and technological progress based on the interaction between electrical and fluid mechanics phenomena. The Symposium will provide an excellent forum to present results, review progress, and discuss future trends in electrohydrodynamics among researchers, engineers, and scientists. This reunion is preceded by international symposiums held every two to three years in different countries (Canada, Italy, France, Poland, and Japan). We warmly invite you to attend and to contribute ISEHD 2019.